Anonymous usage statistics are gathered to monitor and improve the website. This information is not shared with any third parties (except the services used to gather these analytics).
Progress and preferences are stored in browser local storage. Cookies are not used (except for User Account authentication). A user account is not not necessary to play any of the puzzles.
It's possible to create a User Account on the site. In that case, we store account details to enable login. You must explicly grant permission to share these account details with the site. Account details currently include your nickname, email address, and profile picture.
If you have a User Account, you can import and edit your own puzzles. These puzzles are stored on the server. We may analyze these puzzles to automatically determine solutions, check for duplicates, find the rightful author, etc.
If you have a User Account, we may upload your play progress to the server. This may be used to resume playing across multiple browsers and devices. We may also analyze your progress to help improve the website, such as by adding better hints and grading puzzle difficulty.
For all enquiries, please email [email protected].
These terms may be amended at any time. Amendments will be listed here.